Controller of water pump soft startup device

Abstract

The invention discloses a controller of a water pump soft startup device which comprises a voltage sampling unit, a current sampling unit, a synchronous signal detecting unit, a DSP (Digital Signal Processing) control unit, a trigger impulse unit and a communication unit, the voltage sampling unit and the DSP control unit are connected; the current sampling unit and the DSP control unit are connected; the synchronous signal detecting unit and the DSP control unit are connected; the trigger impulse unit and the DSP control unit are connected; and the communication unit and the DSP control unit are connected. A main circuit structure of the traditional thyristor soft startup is taken as a foundation, a trigger angle is adjusted through torsion closed loop control, the electromagnetic torque of a motor is controlled according to a characteristic curve of a water pump system, so that the electromagnetic torque which controls the start-stop of the motor is matched with the characteristic curve of the water pump system, the water pump can start and stop smoothly, and the occurrence of the water hammer phenomenon is avoided.

Description

Technical field [0001] The invention discloses a controller, in particular to a controller of a water pump soft starter, which is the control core of the water pump soft starter. Background technique [0002] Motor soft starters have been widely used today, but traditional soft starters are effective for starting ordinary motors, but the load of the water pump system is different from other working conditions. Because it drives fluid, it has a large Inertia, if the traditional depressurization starting method is used, the acceleration torque can be greatly reduced, but the sudden increase in torque generated by the water pump at the end of the start will still cause an instantaneous impact on the fluid. In terms of soft stop, the linear slope step-down soft stop method cannot effectively improve the performance of the pump system when it is stopped, and often causes the speed of the motor to be unstable and oscillate during the stop process, which may affect the motor and im...

AI Technical Summary

Problems solved by technology

[0002] Motor soft starters have been widely used today, but traditional soft starters are effective for starting ordinary motors, but the load of the water pump system is different from other working conditions. Because it drives fluid, it has a large Inertia, the acceleration torque can be greatly reduced by adopting the traditional reduced-pressure starting method, but the sudden increase torque generated by the water pump at the end of the start-up will still cause an instantaneous impact on the fluid

In terms of soft stop, the linear slope step-down soft stop method cannot effectively improve the performance of the pump system when it is stopped, and often causes the speed of the motor to be unstable and oscillate during the stop process, which may affect the motor and impeller. If it is started frequently, it may cause damage

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